Request请求转发与数据共享-优快云博客

本文探讨了HTTP Request请求在转发过程中的数据共享机制，通过setAttribute、getAttribute和removeAttribute方法实现请求域内的数据传递。举例说明了RequestDemo7如何设置属性，并通过请求转发给RequestDemo8，最终在RequestDemo8中获取并输出这些共享数据。

这里我们说了Request请求转发，下面说说请求转发的共享数据

void setAttribute(String var1, Object var2)：设置属性
Object getAttribute(String var1)：获取属性
void removeAttribute(String var1)：一处属性

直接来例子，RequestDemo7设置属性“love”，然后请求转发给RequestDemo8，RequestDemo8获取输出

RequestDemo7代码

package com.lingaolu.request;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import java.io.IOException;

/**
 * @author 林高禄
 * @create 2020-07-07-16:46
 */
@WebServlet("/requestDemo7")
public class RequestDemo7 extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setAttribute("love","game");
        RequestDispatcher requestDispatcher = request.getRequestDispatcher("/requestDemo8");
        requestDispatcher.forward(request,response);
    }
}

RequestDemo8代码

package com.lingaolu.request;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import java.io.IOException;

/**
 * @author 林高禄
 * @create 2020-07-07-16:46
 */
@WebServlet("/requestDemo8")
public class RequestDemo8 extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        Object love = request.getAttribute("love");
        System.out.println(love);
    }
}